TY - JOUR
T1 - Three-dimensional numerical study on the mechanism of anisotropic MCCI by improved MPS method
AU - Li, Xin
AU - Yamaji, Akifumi
N1 - Funding Information:
The authors would like to express their gratitude to Dr. Christophe Journeau from Commissariat à l'Energie Atomique et aux Energies Alternatives for sharing experimental data on VULCANO VB-U7 test (Ferry et al., 2010), which was funded by the European Atomic Energy Community Sixth Framework Programme under contract No.036403 (PLINIUS FP6). The MPS code of the present study was developed based on the original code, MPS-SW-Main-Ver2.0 which was kindly provided by S. Koshizuka and K. Shibata (Koshizuka and Shibata, 2006). A part of this study is the result of “Deepening Understanding of Ex-Vessel Corium Behavior by Multi-Physics Modeling” carried out under the Center of World Intelligence Project for Nuclear S&T and Human Resource Development by the Ministry of Education, Culture, Sports, Science and Technology of Japan. The financial support from China Scholarship Council (CSC) through offering scholarship to the first author is gratefully acknowledged.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/4/1
Y1 - 2017/4/1
N2 - In two-dimensional (2-D) molten corium-concrete interaction (MCCI) experiments with prototypic corium and siliceous concrete, the more pronounced lateral concrete erosion behavior than that in the axial direction, namely anisotropic ablation, has been a research interest. However, the knowledge of the mechanism on this anisotropic ablation behavior, which is important for severe accident analysis and management, is still limited. In this paper, 3-D simulation of 2-D MCCI experiment VULCANO VB-U7 has been carried out with improved Moving Particle Semi-implicit (MPS) method. Heat conduction, phase change, and corium viscosity models have been developed and incorporated into MPS code MPS-SW-MAIN-Ver.2.0 for current study. The influence of thermally stable silica aggregates has been investigated by setting up different simulation cases for analysis. The simulation results suggested reasonable models and assumptions to be considered in order to achieve best estimation of MCCI with prototypic oxidic corium and siliceous concrete. The simulation results also indicated that silica aggregates can contribute to anisotropic ablation. The mechanisms for anisotropic ablation pattern in siliceous concrete as well as isotropic ablation pattern in limestone-rich concrete have been clarified from a mechanistic perspective.
AB - In two-dimensional (2-D) molten corium-concrete interaction (MCCI) experiments with prototypic corium and siliceous concrete, the more pronounced lateral concrete erosion behavior than that in the axial direction, namely anisotropic ablation, has been a research interest. However, the knowledge of the mechanism on this anisotropic ablation behavior, which is important for severe accident analysis and management, is still limited. In this paper, 3-D simulation of 2-D MCCI experiment VULCANO VB-U7 has been carried out with improved Moving Particle Semi-implicit (MPS) method. Heat conduction, phase change, and corium viscosity models have been developed and incorporated into MPS code MPS-SW-MAIN-Ver.2.0 for current study. The influence of thermally stable silica aggregates has been investigated by setting up different simulation cases for analysis. The simulation results suggested reasonable models and assumptions to be considered in order to achieve best estimation of MCCI with prototypic oxidic corium and siliceous concrete. The simulation results also indicated that silica aggregates can contribute to anisotropic ablation. The mechanisms for anisotropic ablation pattern in siliceous concrete as well as isotropic ablation pattern in limestone-rich concrete have been clarified from a mechanistic perspective.
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U2 - 10.1016/j.nucengdes.2017.01.025
DO - 10.1016/j.nucengdes.2017.01.025
M3 - Article
AN - SCOPUS:85012055167
SN - 0029-5493
VL - 314
SP - 207
EP - 216
JO - Nuclear Engineering and Design
JF - Nuclear Engineering and Design
ER -